Objectplace: Fix NiGHTS bumper angle being reset when WRITETHINGS
When WRITETHINGS, all NiGHTS Bumper vertical angles were reset because their flag values were being fudged after mobj spawn. Don't do this!
Backported from 2.2.
When WRITETHINGS, all NiGHTS Bumper vertical angles were reset because their flag values were being fudged after mobj spawn. Don't do this!
Backported from 2.2.